Phonograph record



March 18, 1930.

Patented Mar. 18, 1930 UNlE TIATES ISIDORE NEFT, OF LOS ANGELES, CALIFOIRNA` PHONOGRAPH RECORD Application filed December 23, 1926. Serial I`o. 156,718.

This invention relates to phonograph records and more particularly to disk records of the type adapted to actuate phonograph stops.

An important object of the invention is to provide a record structure which is particularly adapted for use in connection with phonograph stops of the type which are actuated to stop a phonograph upon movement of the free end of the tone arm outwardly substantially radially of the record after the Stylus is moved inwardly beyond the inner end of the sound groove.

A further object of the invention is to provide a phonograph record which is adapted to cause inward movement of the Stylus, and the free end of the tone arm and then outward movement of these elements to actuate the stopping mechanism.

A further object is to provide a relatively short inwardly projecting extension at the end of the sound groove to efi'eet inward movement of the Stylus, and to provide independent means for efiecting outward movement of the stylus whereby the stop mechanism may be operated.

A further object is to provide a phonograph record of the character referred to wherein an inwardly projecting extension is formed at the inner end of the sound groove, and wherein an independent convolute groove is provided substantially centrally of the record for moving the Stylus outwardly to operate the stopping mechansm.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the drawings I have shown one embodiment of the invention. In this showing,

F igure 1 is a face View of a record constructed in accordance'with the inventinn,

Figure 2 is a section on line 2-2 of Figure 1, and

Figure 3 is an enlarged fragmentary sectional View showing a small rib which may be carried by the record.

Referring to the drawings; the' numeral 10 designates a phonographrecord of the disk type having spiral sound grooves 11 thereon. An inwardly projecting extension 12 is formed at the inner end of the sound groove, and this extension maybe either 'a Continuation of the sound .groove or may be asmall rib 12' (Figure 3) arranged in the path of travel of the stylus as it leaves the inner 'end of the sound groove. The record is provided with the usual central 'opening 13 around which is formed a relatively small convolute i groove 14 which is whollv independent -of the extension 12. The ends f th groov 14 %b overlap and the outer 'end 15 thereof curves outwardly whereby its extremity extends substantially radially of the record disk. p

The operation of the record is as follows:

The record is played in the usual manner by placing 'the Stylus of the phonograph at the outer extremity of the sound groove. When the Stylus reaches the inner extremity of the sound groove it is 'intercepted by the extension 12 which ca'us'es the stylu's and the free end of the tone arm to be swung inwardly, the path of the Stylus being substantially as indicated in the dotted line in Figure 1-. As the stylus continues to move inwardly, it

falls into the groove 14 and continued rotation of the record causes the Stylus to slide from the outer end of the groove 15 substan tially as indicated in dotted lines 'in Figure 1'. As previously stated, the record is particularly adapted for use in connection with the 9 the outer turn of the groove lat it will be intercepted by the inner end of the groove 14 whereby the stop will be caused to operate efec-tively. It will be apparent that while the extension 12 and groove l l cooperate to i i provide means for actuating the stop, these elements are wholly independent of each other in structure, being disconnected from each other.

It is to be understood that the form of the invention herewith shown and described is i to tobe taken as a preferred example of the same and that various changes in the shape,

size and arrangement of parts may be resort- 'ed to Without departing from the spirit of the invention or the scope of the subjoned claims. i

I claim: i e 1. A phonograph record disk having an extension projecting inwardly from the inner extremity of the' sound groove thereof to cause invvard movement of the Stylus of a phonograph, said disk being provided With a wholly independent outvvardly directedinner groove the walls of which are adapted to engage the Stylus and move it outwardly.

2. A phonograph record disk having an extension projecting inwardly from the inner extremity of the sound groove thereof to cause inivard movement of the Stylus of a phonograph, said disk being'provided With an outwardly 'directed inner groove surrounding the center of the disk and spa-ced 'rom said extension, the walls of .said inner groove being adapted to-engage thestylus and move it outwardly. i

3. A phonograph record disk having an g extension projecting inwardly relatvely sharply from the inner extreniity of the sound groove of the record to move the Stylus of a phonograph invvardly toward the center of the record, said disk being provided With a wholly independent outw ardly directed inner groove surrounding the center of the disk e and spaced from said extension, the Walls of said inner groove being adapted to engage the Stylus and move it outwardly.

4. A phonograph record disk having an extension proj'ecting inwardly from the inner extremity of the sound groove thereof to cause invvard movement of the Stylus of a phonograph, said disk being provided With a convolute groove surrounding the center of the record and spaced from said extension' said convolute groove curvin'g outwardly substantiaily radially of the disk, the vvalls of said convolute groove being adapted to move the Stylus outvvardly.:

Intestimony Whereof I aflix my signature.

i ISIDORE E. NEFT. 

